Dana Woodman danawoodman

Rust-like "results" for TypeScript projects

Handling errors in JavaScript/TypeScript kinda sucks. throwing breaks the control flow, is not "discoverable" (e.g. impossible to really know what will happen in error states), and it is generally more tricky to get well typed error responses.

Taking inspiration from Rust's Result type, we can implement something similar in TypeScript with a minimal amount of code and no dependencies. It's not as robust as Rust's of course, but it has been very useful for me on a variety of large projects.

Implementation

Save the following TypeScript in your project and import it to use the various result utils:

Get bun.lock files to work with Cloudflare Workers CI

As of the time of this writing, Cloudflare Workers CI does not work with the newer text-based bun.lock file and instead requires a bun.lockb file to build your app via their CI system.

This usually manifests itself with the following error when trying to deploy your apps using a bun.lock file:

13:48:54.691	Initializing build environment...
13:49:02.821	Success: Finished initializing build environment
13:49:03.776	Cloning repository...

Allow photo album AND the camera

On Android devices, if you want to create a file input that prompts the user to either choose an image from their photo album or take a picture with their camera, you'll need this basically undocumented capture attribute added to your input's accept property:

<input type="file" accept="image/*;capture=camera" />

How to build a Golang application for a Raspberry Pi

Given a binary at cmd/server/main.go, create a binary at bin/server that is built for a Raspberry Pi:

env GOOS=linux GOARCH=arm GOARM=5 go build -o ./bin/server ./cmd/server/main.go

Using Golang templ with the Echo framework

templ is a great view framework but there is no clear documentation (as of writing) showing how to use it with the Echo web framework. This short guide should show you how to set it up:

Install dependencies

Install templ and echo:

go get github.com/a-h/templ

Exclude node_modules and .git from Backblaze backups on Mac

Edit the file at /Library/Backblaze.bzpkg/bzdata/bzexcluderules_editable.xml.
Add these rules inside the bzexclusions tag:

<!-- Exclude node_modules. -->
<excludefname_rule plat="mac" osVers="*"  ruleIsOptional="t" skipFirstCharThenStartsWith="users/" contains_1="/node_modules/" contains_2="*" doesNotContain="*" endsWith="*" hasFileExtension="*" />
<excludefname_rule plat="mac" osVers="*"  ruleIsOptional="t" skipFirstCharThenStartsWith="users/" contains_1="/.git/" contains_2="*" doesNotContain="*" endsWith="*" hasFileExtension="*" />

 import { getContext, setContext } from "svelte";
 /**
  * The context object.
  */
 export interface Context<T> {
   get: () => T;
   set: (ctx: T) => T;
 }

	import argparse, os, sys, glob
	import cv2
	import torch
	import numpy as np
	from omegaconf import OmegaConf
	from PIL import Image
	from tqdm import tqdm, trange
	from imwatermark import WatermarkEncoder
	from itertools import islice
	from einops import rearrange

	#include <FastLED.h>

	// How many leds in your strip?
	#define NUM_LEDS 4

	// For led chips like Neopixels, which have a data line, ground, and power, you just
	// need to define DATA_PIN. For led chipsets that are SPI based (four wires - data, clock,
	// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN
	#define DATA_PIN 23
	#define CLOCK_PIN 22

	#include "FastLED.h"

	FASTLED_USING_NAMESPACE

	// FastLED "100-lines-of-code" demo reel, showing just a few
	// of the kinds of animation patterns you can quickly and easily
	// compose using FastLED.
	//
	// This example also shows one easy way to define multiple
	// animations patterns and have them automatically rotate.